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Refraction is the change in direction of a wave due to a change in its speed. This is most commonly seen when a wave passes from one medium to another. Refraction of light is the most commonly seen example, but any type of wave can refract when it interacts with a medium, for example when sound waves pass from one medium into another or when water waves move into water of a different depth.

http://en.wikipedia.org/wiki/Refraction

http://en.wikipedia.org/wiki/The_Dark_Side_of_the_Moon

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